Win 10 IoT - Blink

Thanks to Microsoft and its UWP application, Win 10 IoT device can share the same framework of normal Win 10 application.
In this post, we’ll build a simple short blink application for Win 10 IoT platform. It assums that you’ve already have some knowledgements about GPIO.

Connection

The Raspberry Pi GPIO pins are defined in Win 10 IoT as following:

There is also a “Power-on Pull” state for each pin. “PullDown” means the pin has no tension, meanwhile “PullUp” means the pin has a high tension. Please check PIN Mapping for some more details.

Here we choose PIN 11 and PIN 9(Ground) to use. The circuit is like this:

The green wire is connected to PIN 11, the brown to PIN 9.

Code

1. Use GpioController gpio = GpioController.GetDefault(); to get GPIO controller.
2. Use GpioPin pin = gpio.OpenPin(17) to open a gpio port. PIN 11 is GPIO 17 in Win 10 IoT.
3. Write HIGH to this port pin.Write(GpioPinValue.High);.
4. Set to output mode pin.SetDriveMode(GpioPinDriveMode.Output);.
5. Close port(Here we use using to make it close automately).

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        this.GPIO();
    }
    
    DispatcherTimer dispatcherTimer;
    
    public void GPIO()
    {
        // Create a timer and call dispatcherTimer_Tick every 1 second
        dispatcherTimer = new DispatcherTimer();
        dispatcherTimer.Tick += dispatcherTimer_Tick;
        dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
        dispatcherTimer.Start();
    }
    
    public void dispatcherTimer_Tick(object sender, object e)
    {
        // Get the default GPIO controller on the system
        GpioController gpio = GpioController.GetDefault();
        if (gpio == null) return; // GPIO not available on this system
        // Open GPIO 17
        using (GpioPin pin = gpio.OpenPin(17))
        {
            // Latch HIGH value first. This ensures a default value when the pin is set as output
            pin.Write(GpioPinValue.High);

            // Set the IO direction as output
            pin.SetDriveMode(GpioPinDriveMode.Output);
        } // Close pin - will revert to its power-on state
    }
}

Conclusion

This video shows you the result: